τρυπητέον
From LSJ
τοῖς οἰκείοις βουλεύμασιν ἁλίσκεσθαι → hoist by one's own petard, hoist with one's own petard, hoist on one's own petard, hoisted by one's own petard, be hoist with one's own petard
English (LSJ)
A one must bore, Paul.Aeg.6.90.
Greek (Liddell-Scott)
τρῡπητέον: ῥημ. ἐπίθ., δεῖ τρυπᾶν, τρυπητέον ὑμᾶς ἔσωθεν Εὐστ. Πονημάτ. 291. 52.